sudo vim /etc/my.cnf 

# For advice on how to change settings please see # http://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html  [mysqld] # # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # # Remove the leading "# " to disable binary logging # Binary logging captures changes between backups and is enabled by # default. It's default setting is log_bin=binlog # disable_log_bin # # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M # # Remove leading # to revert to previous value for default_authentication_plugin, # this will increase compatibility with older clients. For background, see: # https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin # default-authentication-plugin=mysql_native_password  datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock  log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid  skip-grant-tables  

sudo systemctl restart mysqld 

sudo mysql 

FLUSH PRIVILEGES; 

select user,host from mysql.user where user = 'root';  -- 假如查询结果host的值为 localhost 执行 ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'Lihaozhe!!!@@6633';  -- 假如查询结果host的值为 % 执行 ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'Lihaozhe!!@@6633';  -- 如果遇到 ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement -- 先执行 FLUSH PRIVILEGES; 再修改密码  -- 如果遇到 ERROR 1227 (42000): Access denied; you need (at least one of) the SYSTEM_USER privilege(s) for this operation -- 原因是由于root用户没有SYSTEM_USER权限，加入权限后即可解决： grant system_user on *.* to 'root'; 

FLUSH PRIVILEGES; 

exit; 

sudo vim /etc/my.cnf 

# For advice on how to change settings please see # http://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html [mysqld] # # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # # Remove the leading "# " to disable binary logging # Binary logging captures changes between backups and is enabled by # default. It's default setting is log_bin=binlog # disable_log_bin # # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M # # Remove leading # to revert to previous value for default_authentication_plugin, # this will increase compatibility with older clients. For background, see: # https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin # default-authentication-plugin=mysql_native_password datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid # skip-grant-tables 

sudo systemctl restart mysqld

sudo mysql -uroot -p